My QNAP NAS warned of a SMART error on one of its Red 4TB drives (WD40EFRX). A bad-block scan on the NAS would not clear the error, so I pulled the drive. {Footnote}
Testing the Red drive on a Win 10 PC using WD DLG … quick test and extensive test … indicate that the drive is serviceable. Serviceable. In spite of the SMART “C5” flag, “Current Pending Sector Count” with a raw value of 1.
CrystalDrive reports this error similarly to the QNAP NAS, with a health status of “Caution”.
The drive is essentially useless for the NAS in its current state. My question to y’all readers, are there any guesses at whether there is a good correlation between this drive’s SMART C5 state and the occurrence of a future unrecoverable error?
{Footnote} I got to watch how the “enclosure spare” automatically was joined into the affected RAID5 Group … as well as the automatic rebuild kick off. The rebuild completed, and my NAS is back to being serviceable.
{Footnote 2} I HATE automatic formatting. Assuming an asterisk always is meant by the author as a bullet is idiotic on the part of the dill-wad who spec’ed out this functionality.